Enables you to choose a proper Symbol to be attached along with the Diameter dimensions. These are the following symbols available in the drop-down list:

None Enables you to show None of the available symbols along with the dimension.
DIA before text Enables you to include the DIA symbol before the Diameter dimension.
DIA after text Enables you to include the DIA symbol after the Diameter dimension.
Diameter symbol before text Enables you to include the Diameter symbol (fi) before the Diameter dimension.
Diameter symbol after text Enables you to include the Diameter symbol (fi) after the Diameter dimension.
Spherical diameter symbol Enables you to include the Spherical diameter symbol along with the Diameter dimension.
Square symbol before text Enables you to include a Square symbol before the Diameter dimension text.
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